gauge

If I bought a new Gauge cluster, what are the steps to getting the mileage correct? I found a website that sells all Jeep parts from either wrecked Jeeps or repos. Clusters that are like $200. But I would assume I would have to take it somewhere to have it flashed somehow.

7in screen all digital premium speedometer with roughly 11 miles. Replaces the analog cluster with the small monochrome 3" screen to the all digital 7" color screen. Dealer can correct the mileage or you can use a mail in service. Like new condition. Will add off-road pages to the cluster...